Quick way to run flask on 0.0.0.0:80 in company's intranet

Question

I am noticing that the Flask default server should not be used for the production server.
However, in my case, I just want to share a prototype web application created by Flask in the company's intranet using port80.
I tried to specify port referring to stackoverflow page by the following code.

if __name__ == "__main__":
app.run(host='0.0.0.0',port=80)

But they still run on 127.0.0.1:5000. (refer to screen capture of command prompt)
Does anyone know what I should revise in order to run the flask application using port 80?

Answer 1

Please try to run it with

python <yourfile>.py

flask run might be a cause of your problem

Answer 2

As mentioned in the Documentation, flask run will run the development server on 127.0.0.1:5000 and ignore your app.run:

The run command will start the development server. It replaces the Flask.run() method in most cases.

https://flask.palletsprojects.com/en/1.0.x/cli/#run-the-development-server

So instead of using flask run just execute your script directly with Python.

Answer 3

The correct way to launch this using flask run is by specifying the -h flag:

flask run -h 0.0.0.0